How can I rotate a RigidBody so it is facing the direction it is moving using velocity to move?,Rotate RigidBody facing to match velocity direction

Im new to programming so Im sorry if I am making an obvious mistake (I made all this code by myself so im sorry if its a bit of a mess) but I dont know how to make my rigidbody (player) rotate to match the direction its moving (I used velocity for the movement).

This is my code (I will also upload an image):`using System.Collections; using System.Collections.Generic; using UnityEngine;

public class PlayerMovement : MonoBehaviour { public Rigidbody rb;

 // Start is called before the first frame update
 void Start()
 {
     rb = GetComponent<Rigidbody>();
 }

 // Update is called once per frame
 void Update()
 {
     {
         //MOVER EN DIAGONALES
         if (((Input.GetKey("d")) || (Input.GetKey("right"))) && ((Input.GetKey("w")) || (Input.GetKey("up"))))
         {
             rb.velocity = new Vector3(10, 0, 10);
             Debug.Log("DerechaArriba");
         }

         else if (((Input.GetKey("d")) || (Input.GetKey("right"))) && ((Input.GetKey("s")) || (Input.GetKey("down"))))
         {
             rb.velocity = new Vector3(10, 0, -10);
             Debug.Log("DerechaAbajo");
         }

         else if (((Input.GetKey("a")) || (Input.GetKey("left"))) && ((Input.GetKey("w")) || (Input.GetKey("up"))))
         {
             rb.velocity = new Vector3(-10, 0, 10);
             Debug.Log("IzquierdaArriba");
         }

         else if (((Input.GetKey("a")) || (Input.GetKey("left"))) && ((Input.GetKey("s")) || (Input.GetKey("down"))))
         {
             rb.velocity = new Vector3(-10, 0, -10);
             Debug.Log("IzquierdaAbajo");
         }





         //MOVER EN EJES COORDENADOS
         else if ((Input.GetKey("a")) || (Input.GetKey("left")))
         {
             rb.velocity = new Vector3(-15, 0, 0);
             Debug.Log("Izquierda");
         }

         else if ((Input.GetKey("d")) || (Input.GetKey("right")))
         {
             rb.velocity = new Vector3(15, 0, 0);
             Debug.Log("Derecha");
         }

         else if ((Input.GetKey("w")) || (Input.GetKey("up")))
         {
             rb.velocity = new Vector3(0, 0, 15);
             Debug.Log("Arriba");
         }

         else if ((Input.GetKey("s")) || (Input.GetKey("down")))
         {
             rb.velocity = new Vector3(0, 0, -15);
             Debug.Log("Abajo");
         }




         //QUIETO
         else
         {
             rb.velocity = new Vector3(0, 0, 0);
             Debug.Log("Quieto");
         }
     }



     
 }

} ![alt text][1] [1]: /storage/temp/197118-codigo-mio-sin-rotar.png ,Im new to programming so Im sorry if I am making an obvious mistake (I made all this code by myself so im sorry if its a bit of a mess) but I dont know how to make my rigid body (player) rotate to match the direction its moving (I used velocity for the movement). This is my code (I will also upload an image):using System.Collections; using System.Collections.Generic; using UnityEngine;

public class PlayerMovement : MonoBehaviour { public Rigidbody rb;

 // Start is called before the first frame update
 void Start()
 {
     rb = GetComponent<Rigidbody>();
 }

 // Update is called once per frame
 void Update()
 {
     {
         //MOVER EN DIAGONALES
         if (((Input.GetKey("d")) || (Input.GetKey("right"))) && ((Input.GetKey("w")) || (Input.GetKey("up"))))
         {
             rb.velocity = new Vector3(10, 0, 10);
             Debug.Log("DerechaArriba");
         }

         else if (((Input.GetKey("d")) || (Input.GetKey("right"))) && ((Input.GetKey("s")) || (Input.GetKey("down"))))
         {
             rb.velocity = new Vector3(10, 0, -10);
             Debug.Log("DerechaAbajo");
         }

         else if (((Input.GetKey("a")) || (Input.GetKey("left"))) && ((Input.GetKey("w")) || (Input.GetKey("up"))))
         {
             rb.velocity = new Vector3(-10, 0, 10);
             Debug.Log("IzquierdaArriba");
         }

         else if (((Input.GetKey("a")) || (Input.GetKey("left"))) && ((Input.GetKey("s")) || (Input.GetKey("down"))))
         {
             rb.velocity = new Vector3(-10, 0, -10);
             Debug.Log("IzquierdaAbajo");
         }





         //MOVER EN EJES COORDENADOS
         else if ((Input.GetKey("a")) || (Input.GetKey("left")))
         {
             rb.velocity = new Vector3(-15, 0, 0);
             Debug.Log("Izquierda");
         }

         else if ((Input.GetKey("d")) || (Input.GetKey("right")))
         {
             rb.velocity = new Vector3(15, 0, 0);
             Debug.Log("Derecha");
         }

         else if ((Input.GetKey("w")) || (Input.GetKey("up")))
         {
             rb.velocity = new Vector3(0, 0, 15);
             Debug.Log("Arriba");
         }

         else if ((Input.GetKey("s")) || (Input.GetKey("down")))
         {
             rb.velocity = new Vector3(0, 0, -15);
             Debug.Log("Abajo");
         }




         //QUIETO
         else
         {
             rb.velocity = new Vector3(0, 0, 0);
             Debug.Log("Quieto");
         }
     }



     
 }

}`